I do have other reasons as well, including but not limited to the simple understanding that no matter how much my parents think differently, I would not be a good father. That said, it's no joke that any given person not having kids produces a larger "carbon credit" than basically any other choice they can make. I also think that your apparent view that intelligent people owe the human race children is a bit ridiculous. Children are in vast oversupply and many of them don't have loving homes - if people want children, there are plenty of them waiting to be adopted, and with intelligent, caring parents raising them, those children can become good, productive members of society.
To your last point, though, the booger-eating crotchfruit idiocracy has basically overwhelmed the rest of us. I'm not convinced that they haven't already won.